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1f3d02756b
We want to see partial command results as soon as possible. But the buffering mode of stdout (= pager's stdin) was set to fully-buffered because it isn't associated with a tty. So, this patch recreates new stdout object to force its buffering mode. Because two file objects are associated with the same stdout fd and their destructors will call close(), one of them must be closed carefully. Python expects that the stdout fd never be closed even after sys.stdout.close() [1], but newstdout has no such hack. So this patch calls newstdout.close() immediately before duplicating the original stdout fd to sys.stdout. operation sys.stdout newstdout fd --------------------- ---------- --------- -------- newstdout.close() open closed closed os.dup2(stdoutfd, ..) open closed open del sys.stdout closed closed open [1] [1]: https://hg.python.org/cpython/file/v2.7.10/Python/sysmodule.c#l1391
155 lines
5.2 KiB
Python
155 lines
5.2 KiB
Python
# pager.py - display output using a pager
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#
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# Copyright 2008 David Soria Parra <dsp@php.net>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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#
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# To load the extension, add it to your configuration file:
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#
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# [extension]
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# pager =
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#
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# Run "hg help pager" to get info on configuration.
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'''browse command output with an external pager
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To set the pager that should be used, set the application variable::
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[pager]
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pager = less -FRX
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If no pager is set, the pager extensions uses the environment variable
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$PAGER. If neither pager.pager, nor $PAGER is set, no pager is used.
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You can disable the pager for certain commands by adding them to the
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pager.ignore list::
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[pager]
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ignore = version, help, update
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You can also enable the pager only for certain commands using
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pager.attend. Below is the default list of commands to be paged::
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[pager]
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attend = annotate, cat, diff, export, glog, log, qdiff
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Setting pager.attend to an empty value will cause all commands to be
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paged.
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If pager.attend is present, pager.ignore will be ignored.
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Lastly, you can enable and disable paging for individual commands with
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the attend-<command> option. This setting takes precedence over
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existing attend and ignore options and defaults::
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[pager]
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attend-cat = false
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To ignore global commands like :hg:`version` or :hg:`help`, you have
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to specify them in your user configuration file.
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The --pager=... option can also be used to control when the pager is
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used. Use a boolean value like yes, no, on, off, or use auto for
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normal behavior.
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'''
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import atexit, sys, os, signal, subprocess
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from mercurial import commands, dispatch, util, extensions, cmdutil
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from mercurial.i18n import _
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# Note for extension authors: ONLY specify testedwith = 'internal' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'internal'
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def _runpager(ui, p):
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pager = subprocess.Popen(p, shell=True, bufsize=-1,
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close_fds=util.closefds, stdin=subprocess.PIPE,
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stdout=sys.stdout, stderr=sys.stderr)
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# back up original file objects and descriptors
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olduifout = ui.fout
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oldstdout = sys.stdout
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stdoutfd = os.dup(sys.stdout.fileno())
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stderrfd = os.dup(sys.stderr.fileno())
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# create new line-buffered stdout so that output can show up immediately
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ui.fout = sys.stdout = newstdout = os.fdopen(sys.stdout.fileno(), 'wb', 1)
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os.dup2(pager.stdin.fileno(), sys.stdout.fileno())
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if ui._isatty(sys.stderr):
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os.dup2(pager.stdin.fileno(), sys.stderr.fileno())
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@atexit.register
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def killpager():
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if util.safehasattr(signal, "SIGINT"):
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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pager.stdin.close()
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ui.fout = olduifout
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sys.stdout = oldstdout
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# close new stdout while it's associated with pager; otherwise stdout
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# fd would be closed when newstdout is deleted
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newstdout.close()
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# restore original fds: stdout is open again
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os.dup2(stdoutfd, sys.stdout.fileno())
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os.dup2(stderrfd, sys.stderr.fileno())
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pager.wait()
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def uisetup(ui):
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if '--debugger' in sys.argv or not ui.formatted():
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return
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def pagecmd(orig, ui, options, cmd, cmdfunc):
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p = ui.config("pager", "pager", os.environ.get("PAGER"))
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usepager = False
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always = util.parsebool(options['pager'])
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auto = options['pager'] == 'auto'
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if not p:
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pass
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elif always:
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usepager = True
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elif not auto:
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usepager = False
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else:
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attend = ui.configlist('pager', 'attend', attended)
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ignore = ui.configlist('pager', 'ignore')
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cmds, _ = cmdutil.findcmd(cmd, commands.table)
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for cmd in cmds:
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var = 'attend-%s' % cmd
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if ui.config('pager', var):
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usepager = ui.configbool('pager', var)
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break
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if (cmd in attend or
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(cmd not in ignore and not attend)):
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usepager = True
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break
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setattr(ui, 'pageractive', usepager)
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if usepager:
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ui.setconfig('ui', 'formatted', ui.formatted(), 'pager')
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ui.setconfig('ui', 'interactive', False, 'pager')
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if util.safehasattr(signal, "SIGPIPE"):
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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_runpager(ui, p)
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return orig(ui, options, cmd, cmdfunc)
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# Wrap dispatch._runcommand after color is loaded so color can see
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# ui.pageractive. Otherwise, if we loaded first, color's wrapped
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# dispatch._runcommand would run without having access to ui.pageractive.
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def afterloaded(loaded):
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extensions.wrapfunction(dispatch, '_runcommand', pagecmd)
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extensions.afterloaded('color', afterloaded)
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def extsetup(ui):
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commands.globalopts.append(
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('', 'pager', 'auto',
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_("when to paginate (boolean, always, auto, or never)"),
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_('TYPE')))
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attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff']
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